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Energy retrofit of an apartment house in Donostia - San Sebastián (País Vasco)
Case study
Spain
Energy retrofit of an apartment house in Donostia - San Sebastián (País Vasco)
Editorial Team
Energy retrofit of a apartment house in the center of the city, builded in the beginning of the 20th, carried out in 2 phases: EnerPHit-Step by Step. In Phase 1, 2 apartments were totally refurbished, both the thermal envelope and the active system of climate conditioning. The facades of the building are cataloged, so all the interventions have been carried out inside the envelope, respecting the classicist aesthetics of the original building.
THERMAL ENVELOPE
Exterior wall INT:
Plasterboard 13mm
Plasterboard 15mm
Mineral Wool 80mm
Existing Stone Wall 600mmEXT
U-value = 0.347 W/(m2K)
Basement floor / floor slab INT:
Wood 14mm
Cement screed 40mm
XPS 80mm
Existing Wood 30mm
Air Layer 390mm
Muneral Wool 160mm
Plasterboard 13mm
EXT
U-value = 0.116 W/(m2K)
Roof EXT:
Ceramic Layer 30mm
Cement Screed 40mm
XPS 100mm
Cement Screed 50mm
Wood 30mm
Air Layer 190mm
Mineral Wool 200mm
Plasterboard 13mm
INT
U-value = 0.102 W/(m2K)
MECHANICAL SYSTEM
Ventilation: SIBER, DF SKY 1
Passivhaus Certified Ventilation unit in all the apartments.
Heating installation: Individual gas boiler in all the apartments.
Domestic hot water: Individual gas boiler in all the apartments.
PHPP VALUES
Air tightness n50 = 1/h
Annual heating demand: 13 kWh /(m2a ) calculated according to PHPP
Heating load: 12 W/m2
PE demand (non-renewable Primary Energy): 59 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.
PER demand (renewable Primary Energy): 59 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.
